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微信公众号“sx880A8”第253期印度尼西亚国旗（Indonesia flag）
Author:
沈翔
Topic:
Constructions
GeoGebra
New Resources
直角坐標平面上的旋轉變換
兩位數除以一位數（一）
近似值：有效數字
兩組對邊相等的四邊形
算柱 (兩位數)
Discover Resources
題四
Ambiguous Cylinder illusion
circle
两角和的正弦公式
刘校安排（1）
Discover Topics
Cylinder
Right Triangles
Planes
Trigonometric Functions
Intersection